linux-kernel - Re: [PATCH v14 00/74] Convert page cache to XArray

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Date:   Mon, 30 Jul 2018 08:43:10 -0700
From:   Matthew Wilcox <willy@...radead.org>
To:     Ross Zwisler <ross.zwisler@...ux.intel.com>, zwisler@...nel.org,
        linux-mm@...ck.org, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org, Jan Kara <jack@...e.cz>,
        Jeff Layton <jlayton@...hat.com>,
        Lukas Czerner <lczerner@...hat.com>,
        Christoph Hellwig <hch@....de>,
        Goldwyn Rodrigues <rgoldwyn@...e.com>,
        Nicholas Piggin <npiggin@...il.com>,
        Ryusuke Konishi <konishi.ryusuke@....ntt.co.jp>,
        linux-nilfs@...r.kernel.org, Jaegeuk Kim <jaegeuk@...nel.org>,
        Chao Yu <yuchao0@...wei.com>,
        linux-f2fs-devel@...ts.sourceforge.net
Subject: Re: [PATCH v14 00/74] Convert page cache to XArray

On Fri, Jul 27, 2018 at 11:20:35AM -0600, Ross Zwisler wrote:
> Okay, the next failure I'm hitting is with DAX + XFS + generic/344.  It
> doesn't happen every time, but I can usually recreate it within 10 iterations
> of the test.  Here's the failure:

Thanks.  I've made some progress with this; the WARNing is coming from
a vm_insert_* mkwrite call.  Inserting sufficient debugging code has
let me determine we still have a zero_pfn in the page table when we're
trying to insert a new PFN.